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Brian and I decided to build him an electric bike conversion so he can ride his bike to work. The problem with the ride normally is a gigantic hill on the way home. Our goal was to boost him up the hills, while still allowing him to bike normally (except with a heavy bike).

We based the design off of Eric Peltzer's Electric Bicycle. We modified the design to take into account a few major differences. We didn't want to weld anything, we wanted it to be cheaper, and we have access to a waterjet cutter.

Brian purchased a XYD-13 motor kit, which is a 600W motor that normally goes on a Currie Electric scooter. It came with a speed controller, and we had an option for a twist grip, or a thumb control. We also ordered a shaft, bearings, etc from McMaster Carr, and a small set of 10Ah batteries and charger. If he doesn't get enough range on the bike, the plan is to upgrade the batteries.

The motor came with an excellent one-way clutch built into the sprocket. We decided to keep this, which allows the motor pulley to freewheel while the bike is being pedaled.

Last weekend, after we had waterjet out the motor assembly frame, we spent a few hours assembling:Full Gallery LinkThe motor assembly

2008-07-10

Things I may be able to add to boxes (pictures and more updates to come later):Blank Circuit Boards (up to 15" on a side)ICs of all flavorsCharacter LCDsOld graphic LCDs (10+ inch)Ubicom (Scenix, Parallax) SX chips

2008-03-28

We had a great time at the Microsoft Seattle Regional. We placed 2nd out of 31, and we made it to the semi-finals. We had quite a few excellent matches, and I was very happy to have my friend Mike Bastoni in town to see it. I'll write more about it later, but I wanted to share this banner made by the database of TheBlueAlliance.net, which looks like a great resource for watching match videos of the events.

No video yet from the seattle event, but they are posting videos from all the events that have webcasts, and are actually only a few matches behind at any given moment. Be sure the check out the events live on webcast where possible. The Boston regional has some very strong teams at the top of the list, and a few matches in Hawaii today made it clear that there were a number of teams that had won previous regionals present.